1/*
2 * i.MX drm driver - parallel display implementation
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/component.h>
17#include <linux/module.h>
18#include <drm/drmP.h>
19#include <drm/drm_fb_helper.h>
20#include <drm/drm_crtc_helper.h>
21#include <drm/drm_panel.h>
22#include <linux/videodev2.h>
23#include <video/of_display_timing.h>
24
25#include "imx-drm.h"
26
27#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
28#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
29
30struct imx_parallel_display {
31	struct drm_connector connector;
32	struct drm_encoder encoder;
33	struct device *dev;
34	void *edid;
35	int edid_len;
36	u32 bus_format;
37	int mode_valid;
38	struct drm_display_mode mode;
39	struct drm_panel *panel;
40};
41
42static enum drm_connector_status imx_pd_connector_detect(
43		struct drm_connector *connector, bool force)
44{
45	return connector_status_connected;
46}
47
48static int imx_pd_connector_get_modes(struct drm_connector *connector)
49{
50	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
51	struct device_node *np = imxpd->dev->of_node;
52	int num_modes = 0;
53
54	if (imxpd->panel && imxpd->panel->funcs &&
55	    imxpd->panel->funcs->get_modes) {
56		num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
57		if (num_modes > 0)
58			return num_modes;
59	}
60
61	if (imxpd->edid) {
62		drm_mode_connector_update_edid_property(connector, imxpd->edid);
63		num_modes = drm_add_edid_modes(connector, imxpd->edid);
64	}
65
66	if (imxpd->mode_valid) {
67		struct drm_display_mode *mode = drm_mode_create(connector->dev);
68
69		if (!mode)
70			return -EINVAL;
71		drm_mode_copy(mode, &imxpd->mode);
72		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
73		drm_mode_probed_add(connector, mode);
74		num_modes++;
75	}
76
77	if (np) {
78		struct drm_display_mode *mode = drm_mode_create(connector->dev);
79
80		if (!mode)
81			return -EINVAL;
82		of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
83		drm_mode_copy(mode, &imxpd->mode);
84		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
85		drm_mode_probed_add(connector, mode);
86		num_modes++;
87	}
88
89	return num_modes;
90}
91
92static struct drm_encoder *imx_pd_connector_best_encoder(
93		struct drm_connector *connector)
94{
95	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
96
97	return &imxpd->encoder;
98}
99
100static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
101{
102	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
103
104	if (mode != DRM_MODE_DPMS_ON)
105		drm_panel_disable(imxpd->panel);
106	else
107		drm_panel_enable(imxpd->panel);
108}
109
110static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
111			   const struct drm_display_mode *mode,
112			   struct drm_display_mode *adjusted_mode)
113{
114	return true;
115}
116
117static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
118{
119	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
120
121	imx_drm_set_bus_format(encoder, imxpd->bus_format);
122}
123
124static void imx_pd_encoder_commit(struct drm_encoder *encoder)
125{
126	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
127
128	drm_panel_prepare(imxpd->panel);
129	drm_panel_enable(imxpd->panel);
130}
131
132static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
133			 struct drm_display_mode *orig_mode,
134			 struct drm_display_mode *mode)
135{
136}
137
138static void imx_pd_encoder_disable(struct drm_encoder *encoder)
139{
140	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
141
142	drm_panel_disable(imxpd->panel);
143	drm_panel_unprepare(imxpd->panel);
144}
145
146static struct drm_connector_funcs imx_pd_connector_funcs = {
147	.dpms = drm_helper_connector_dpms,
148	.fill_modes = drm_helper_probe_single_connector_modes,
149	.detect = imx_pd_connector_detect,
150	.destroy = imx_drm_connector_destroy,
151};
152
153static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
154	.get_modes = imx_pd_connector_get_modes,
155	.best_encoder = imx_pd_connector_best_encoder,
156};
157
158static struct drm_encoder_funcs imx_pd_encoder_funcs = {
159	.destroy = imx_drm_encoder_destroy,
160};
161
162static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
163	.dpms = imx_pd_encoder_dpms,
164	.mode_fixup = imx_pd_encoder_mode_fixup,
165	.prepare = imx_pd_encoder_prepare,
166	.commit = imx_pd_encoder_commit,
167	.mode_set = imx_pd_encoder_mode_set,
168	.disable = imx_pd_encoder_disable,
169};
170
171static int imx_pd_register(struct drm_device *drm,
172	struct imx_parallel_display *imxpd)
173{
174	int ret;
175
176	ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
177				       imxpd->dev->of_node);
178	if (ret)
179		return ret;
180
181	/* set the connector's dpms to OFF so that
182	 * drm_helper_connector_dpms() won't return
183	 * immediately since the current state is ON
184	 * at this point.
185	 */
186	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
187
188	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
189	drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
190			 DRM_MODE_ENCODER_NONE);
191
192	drm_connector_helper_add(&imxpd->connector,
193			&imx_pd_connector_helper_funcs);
194	drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
195			   DRM_MODE_CONNECTOR_VGA);
196
197	if (imxpd->panel)
198		drm_panel_attach(imxpd->panel, &imxpd->connector);
199
200	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
201
202	imxpd->connector.encoder = &imxpd->encoder;
203
204	return 0;
205}
206
207static int imx_pd_bind(struct device *dev, struct device *master, void *data)
208{
209	struct drm_device *drm = data;
210	struct device_node *np = dev->of_node;
211	struct device_node *panel_node;
212	const u8 *edidp;
213	struct imx_parallel_display *imxpd;
214	int ret;
215	const char *fmt;
216
217	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
218	if (!imxpd)
219		return -ENOMEM;
220
221	edidp = of_get_property(np, "edid", &imxpd->edid_len);
222	if (edidp)
223		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
224
225	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
226	if (!ret) {
227		if (!strcmp(fmt, "rgb24"))
228			imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
229		else if (!strcmp(fmt, "rgb565"))
230			imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
231		else if (!strcmp(fmt, "bgr666"))
232			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
233		else if (!strcmp(fmt, "lvds666"))
234			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
235	}
236
237	panel_node = of_parse_phandle(np, "fsl,panel", 0);
238	if (panel_node) {
239		imxpd->panel = of_drm_find_panel(panel_node);
240		if (!imxpd->panel)
241			return -EPROBE_DEFER;
242	}
243
244	imxpd->dev = dev;
245
246	ret = imx_pd_register(drm, imxpd);
247	if (ret)
248		return ret;
249
250	dev_set_drvdata(dev, imxpd);
251
252	return 0;
253}
254
255static void imx_pd_unbind(struct device *dev, struct device *master,
256	void *data)
257{
258	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
259
260	imxpd->encoder.funcs->destroy(&imxpd->encoder);
261	imxpd->connector.funcs->destroy(&imxpd->connector);
262
263	kfree(imxpd->edid);
264}
265
266static const struct component_ops imx_pd_ops = {
267	.bind	= imx_pd_bind,
268	.unbind	= imx_pd_unbind,
269};
270
271static int imx_pd_probe(struct platform_device *pdev)
272{
273	return component_add(&pdev->dev, &imx_pd_ops);
274}
275
276static int imx_pd_remove(struct platform_device *pdev)
277{
278	component_del(&pdev->dev, &imx_pd_ops);
279
280	return 0;
281}
282
283static const struct of_device_id imx_pd_dt_ids[] = {
284	{ .compatible = "fsl,imx-parallel-display", },
285	{ /* sentinel */ }
286};
287MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
288
289static struct platform_driver imx_pd_driver = {
290	.probe		= imx_pd_probe,
291	.remove		= imx_pd_remove,
292	.driver		= {
293		.of_match_table = imx_pd_dt_ids,
294		.name	= "imx-parallel-display",
295	},
296};
297
298module_platform_driver(imx_pd_driver);
299
300MODULE_DESCRIPTION("i.MX parallel display driver");
301MODULE_AUTHOR("Sascha Hauer, Pengutronix");
302MODULE_LICENSE("GPL");
303MODULE_ALIAS("platform:imx-parallel-display");
304